Going through stuff that I stored 10 years ago, I know better but didn't look both ways.
It was a 386, now only good for parts. Don't be like me.
You can probably fix it wiring point to point on the bottom side of the board. I fixed a few leaking boards that way. Generally just the keyboard section and the removable battery port are affected, in your case maybe some power traces also. Anything affected on the bottom side?
Woah--you mean that happened only when you powered the board? Nothing to do with the battery, I think. Maybe you should offer it for shipping to someone with an itchy soldering iron.
I'm with chuck on this one. thats not a battery issue, that looks like someone plugged the power supply cables in backwards...
I wonder how you would know what that looks like LOL!
Board still looks repairable to me though. I'd clean off the corrosion best I could , oil that part up with wd40 or some sort of electronics goop and toss it back in a bag for a rainy day... Could make a good project in the future! =D